系统会通过不绘制窗口来显示隐藏的窗口。

The system displays a hidden window by not drawing it.

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您还将学习如何修改用于绘制窗口小部件(例如复选框、单选按钮、树以及文件对话框)的图标。

You'll also learn how to modify the ICONS used to draw widgets such as check boxes, radio buttons, trees, and file dialogs.

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您首先要画出正方形，然后再指定该显示窗口后面绘制图形的旋转操作。

You draw your square first, then specify the rotation operation that is applied to the subsequent shapes drawn to the display window.

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